Your comment about logic is the only thing I disagree with. I keep reading that bigger is fine but even if there's no lug problem I bet there's either a specialty wire so thick that's being used somewhere what would cause a problem, or else there's a theoretical wire so thick that it would cause a problem. If you dig a long ditch, about 5' x 5' wide, and fill it with molten wire grade copper and wait for it to harden and try powering household stuff with it, don't you figure there would be a problem?

It would only be a 'problem' if the pit was not properly insulated to isolate it from earth.

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Even if you are on the right track, you will still get run over if you just sit there.

Your previous post refer'd to a 5'x5' conductor of solid copper. Assuming it was properly insulated, it would not be a 'technical' problem. Practical? No....a Problem? No.

A conductor the size of the Earth? Well, it already is a conductor.

Now we are getting off topic and a bit ridiculous...

Back to the OP's original question....would installing a larger conductor than what is required for the current installation be a problem? No.....there are no 'technical' reasons that would create a problem. Is it practical? Depends on what kind of wire and how much bigger.

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Even if you are on the right track, you will still get run over if you just sit there.

I just wanted to see whether there's any diameter so large that he would think "that may not work." I bet there's information on the theoretical upper limit to the diameter of a wire for effective household use, and it has to do with something other than practicality or cost, and I bet a 5' x 5' thick wire would be too large. Theoretical electrical engineering doesn't need to be taught to even master electricians and the generalizations you all make are fine, practically speaking, but I bet the exact truth would contradict you on this. There is nothing logical about thinking there's no wire too large.